Did you notice any change in engine sound with the SDI fitted?
Yesterday i fitted them and i really didn´t notice nothing special but when i was picking up a friend, she was waiting me on the street and asking what i did to the car because it was "louder" and have "strong" noise.
About results, the car feels a lot more powerfull, specially in low revs. I didn´t change the turbo boost but the injectors for themself did. It was making about low 17´s and now low 18´s.
I dont see any special smoke, only a bit, but nothing like a train. I´ve cleaned the EGR, maybe that did help.
It does some "hesitation" sometimes when slowing down, but nothing special. With the clip mode it did a lot more!